Calculator



(No Model.

W. A. GOPELAND, C. ROBERTS 8v T. J. MGGRARY. CALCULATOR.

No. 569,544. Patented Oct. 13, 1896.

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UNITED STATES WESLEY ALBERT OOPELAND, OYRUS ROBERTS, AND THOMAS JEFFERSON,

PATENT OFFICE.

MCORARY, OF ALVORD, TEXAS.

CALCU LATO R.

SPECIFICATION forming part of Letters Patent No. 569,544, dated October 13, 1896.

Application iiled. May 13, 1896. Serial No. 591,399. (No model.)

To all whom it 11m/y concer/L:

Be it known that we, VESLEY ALBERT COPELAND, CYRUs RoBEn'rs, and THOMAS JEFFERSON MCORAEY, of Alvord, in the county of NVise and State of Texas, have invented a new and useful Improvement in Calculators, of which the following is a speciiication.

Our invention relates to that class of calculators in which a bar having a series of numbers thereon slides in a frame or base also provided with a series of numbers, and has for its object to provide a simple, cheap, and accurate calculator which is susceptible of easy and rapid manipulation. i

To this end our invention consists of a frame or base piece provided with a series of numbers carrying a sliding bar also provided with a series of numbers and a sliding lever or pusher for moving said sliding bar. It further consists in certain details of construction, which will be hereinafter fully described, and pointed out in the claims.

In the drawings, Figure 1 is a perspective view of our improved device. Fig. 2 is an end View partly in section. Fig. 3 is a crosssection showing a modified form. Fig. 4 is a section of another modification.

A represents a frame or base piece of any suitable size and material and has in one of its faces a groove G, one of whose edges is preferably undercut. Along one edge of this groove, preferably the straight edge, are placed the digits 'from 0 to 9, inclusive, the zero being near the bottom of the frame A, the remainder of the numbers extending upwardly in regular order. At the Zero-mark a pin or stop O' is placed in the frame, the purpose or" which will be described later on.

On the other side of the groove the lever or pusher D is slidably held by the screweyes or guides cl. The lever or pusher D comprises a straight portion having at or near its center the pointer D', extending at right angles to the main portion and having a handle or lifting portion D2 at about its center. To the face of the frame, and on same side of the groove G on which the sliding lever or pusher D is situated, an index pointer E is rigidly secured, extending partly across the groove and being placed exactly opposite and pointing to the zero-mark on the opposite `the undercut edge of the groove, and thus the bar B is held in said groove in such a manner as to be prevented from falling face outward from the groove. The sliding bar B is provided on its straight longitudinal edge with a serrated metal plate BQ similar in appearance to a saw-blade, extending outwardly at right angles from the said bar B. The teeth or serrations d on B are ot' uniform size and distance apart and extend from end to end of the bar B. Oommencing at the lower end and extending to the top, iigures from O to 108 are placed on the sliding bar B, onevnumber being. opposite each one of the notches between the teeth d. Near the bottom of the bar B is placed a pin or stop b', which, by abutting against index pointer E, prevents the sliding bar B from being raised above its proper starting position. Near one ot 'the upper corners, or 4any other suitable place on the base-block A,is placed a series of peg-holes F, which are num- LlOO (20077) (300,77 (E LOOJW ((500,77 and so on.

To operate our calculator, the sliding bar o B is so positioned in the groove that the zero on said bar is exactly opposite the zero on the frame or base A on the opposite edge of the groove.

The pointerD' of the sliding lever or pusher D is then swung over and moved up or down until it is opposite the first number it is desired to add on the sliding bar. It is then dropped into the serration opposite that number, when the whole lever or pusher D is slid downward, carrying the sliding bar B with it, until the projecting end of the pointer D' strikes the pin O', which is placed at zero on the base-piece A. This operation is repeated for the next number, and when this has been done the index-pointer E will indicate the correct result on the sliding bar B.

To illustrate, suppose that it is desired to add IOO

See that '/.cro on the sliding bar and zero en the frame are opposite and in line with each other. Swing the arm D/ of the lever or pusher over and drop it in the notch opposite the figure i3 on the frame. Draw it down until D strikes the pin C, which is Zero. Repeat this operation for the (i am 7 and the sum (15) of the three numbers will be found opposite the index-pointer on the sliding bar B. Vi-ite down the 5 and push back the sliding bar, reserving the 1. Treat the remaining eolu mns in a like manner, lreserving the figures to be carried on the sliding bar ll.

Should the amount of any single column exceed one hundred, (100,) place a pcg or pin in the peg-hole marked in the 100 series of holes F, located at upper rightehand corner of frame, and duplicate the operation, reserving the surplus on sliding bar l. In this manner verylong columns of figures may be added with rapidity and accuracy.

The various parts of the device may be made of wood, metal, or other suitable inaterial and may be made plain or ornamental, as desired.

The serrated plate B may be placed on the face of the sliding bar B instead of at one edge, and the sliding bar l, may be held on the frame or base by guides instead of being seated in the groove G, as shown in Fig. 3.

'lhe sliding bar li may be made with both edges beveledJ which fit in a groove haviilg undercut edges, as shown in Fig. l. When this form is used, the serrated plate B is secured to the upper face et the sliding bar i3.

Having thus described our invention, what we claim, and desi rc to secure by Letters Patent, is-

l. A calculatorcomprising a frame or base provided with a series of numbers, a sliding bar having longitudinal serrations thereon, and provided with suitable num bers opposite said serrations, a lever or pusher movably held to the frame orbase adapted to be swung into engagement with the serrations on said sliding bar and having a sliding movement on the base, substantially as shown and described.

2. A calculator comprising a trame or base, abar sl'idably connected therewith and provided with a longitudinal serrated plate, a lever or pusher movably secured to frame adapted to be swung into engagement with said serrated plate having a sliding movement on the base, and a stop on the frame or base for limiting the movement oi' said lever or pusher, substantially as shown and described.

3. A calculator comprising a i' 'ame or base, a stop located near the lower end of said base, a bar slidably secured to said frame, and provided with a longitudinal serrated plate, a lever or pusher movably secured by guides to said irame and adapted to have a swinging aud sliding movement in said guides and provided with a projecting arm whereby it maybe swung into engagement with the serrated plate on the slidingbar and pushed down until engaged by the stop on the 'frame or base, substantially as shown and described.

4. A calculator comprising a frame or base provided with a longitudinal guideway, a row of figures arranged at one end el' the base and at one side of said guideway, a stop placed on the frame or base on the saine side ot the guideway and at the lowest of said ligures, a series of iigures at or near another corner ol' said frame, a lever or pusher movably held in guides on said frame and provided. with a projecting pointer, an index-pointer secured to the frame opposite the stop on the frame, a bar sliding in the guideway ol the frame, and having a row of figures in regular notation on its upper surface and a stop at or .near its lower end, and provided with a longitudi nallyserrated plate adapted to be cngagec'l by the lever or pusher, substantiall y as shown and described.

lVitnesses:

THOMAS C. CARLoss, V. Il. SPARKMAN. 

